Date: Thu, 07 May 2015 14:32:31 +0100 From: Steven Hartland <killing@multiplay.co.uk> To: Ronald Klop <ronald-lists@klop.ws>, Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: freebsd-stable@freebsd.org Subject: Re: zfs, cam sticking on failed disk Message-ID: <554B696F.6020902@multiplay.co.uk> In-Reply-To: <op.xx9o261skndu52@ronaldradial.radialsg.local> References: <20150507095048.GC1394@zxy.spb.ru> <554B40B6.6060902@multiplay.co.uk> <20150507104655.GT62239@zxy.spb.ru> <554B53E8.4000508@multiplay.co.uk> <20150507120508.GX62239@zxy.spb.ru> <554B5BF9.8020709@multiplay.co.uk> <20150507124416.GD1394@zxy.spb.ru> <554B5EB0.1080208@multiplay.co.uk> <20150507125129.GY62239@zxy.spb.ru> <554B6307.9020309@multiplay.co.uk> <20150507131007.GZ62239@zxy.spb.ru> <554B676E.8020500@multiplay.co.uk> <op.xx9o261skndu52@ronaldradial.radialsg.local>
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On 07/05/2015 14:29, Ronald Klop wrote:
> On Thu, 07 May 2015 15:23:58 +0200, Steven Hartland
> <killing@multiplay.co.uk> wrote:
>
>>
>>
>> On 07/05/2015 14:10, Slawa Olhovchenkov wrote:
>>> On Thu, May 07, 2015 at 02:05:11PM +0100, Steven Hartland wrote:
>>>
>>>>
>>>> On 07/05/2015 13:51, Slawa Olhovchenkov wrote:
>>>>> On Thu, May 07, 2015 at 01:46:40PM +0100, Steven Hartland wrote:
>>>>>
>>>>>>>> Yes in theory new requests should go to the other vdev, but
>>>>>>>> there could
>>>>>>>> be some dependency issues preventing that such as a syncing TXG.
>>>>>>> Currenly this pool must not have write activity (from application).
>>>>>>> What about go to the other (mirror) device in the same vdev?
>>>>>>> Same dependency?
>>>>>> Yes, if there's an outstanding TXG, then I believe all IO will
>>>>>> stall.
>>>>> Where this TXG released? When all devices in all vdevs report
>>>>> 'completed'? When at the least one device in all vdevs report
>>>>> 'completed'? When at the least one device in at least one vdev report
>>>>> 'completed'?
>>>> When all devices have report completed or failed.
>>> Thanks for explained.
>>>
>>>> Hence if you pull the disk things should continue as normal, with the
>>>> failed device being marked as such.
>>> I am have trouble to phisical access.
>>> May be someone can be suggest software method to forced detach device
>>> from system.
>> In 11 that should be possible with devctl, but under 10 I'm not aware
>> of anything that wouldn't involve some custom kernel level code I'm
>> afraid.
>>
>
>
> Maybe I'm talking BS here, but does 'camcontrol eject' do something on
> a disk?
I wouldn't have thought so, I would expect that to only have an effect
on removal media such as CDROM drives, but no harm in trying ;-)
Regards
Steve
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